Earlier quoted context omitted.
I don't think your reading lines up with history. Putin was clearly content to allow Ukraine a large degree of sovereignty and autonomy as long as they remained under an authoritarian system. If nationalism was the only driver, why overthrow Yanukovych, thereby spitting in Putin's face and risking domination by another country? What wasn't tolerable to Putin was a bourgeoning democracy on Russia's doorstep with simil…
The "authoritarian system" in question was russia's ethnic-imperial system of empire. That it was "authoritarian" is far less important than its being Russian, ethnically and culturally. The offense to russia was first to turn to the west, and hence as Russia sees it, a counter-empire; and the secondly, the suprise and outrage, to believe that it's a Nation. Both are incomprehensible to Russia -- it has nothing to do…
The "turn to the west" is geopolitical but it's also a turn away from a conservative authoritarian order and toward a liberal democratic order. Is that just a meaningless geopolitical coincidence? No, it's clearly part of the equation, though certainly not the only part.